clocksource/drivers/exynos_mct: Bump up mct max irq number

Bump-up maximum number of MCT IRQ to match the binding
documentation. This make driver scalable for SoC which
has more than 12 timer irqs, like recently added FSD SoC.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
Link: https://lore.kernel.org/r/20220221174547.26176-2-alim.akhtar@samsung.com


Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>